Base door



Patented June 20, 1933 UNITED STATES PATET OFFICE FREDRIK W. HVOSLEF, OF KOI-ILER, WISCONSIN, ASSIGNOR TO KOEILEB COMPANY, OF KOHLER, WISCONSIN, A CORPORATION OF WISCONSIN BASE DOOR Application filed October 22, 1930.

This invention has for its object to provide a base door for boilers or furnaces serving as a sealing closure for both the ash-pit opening and the clinker opening and also serving to effectively seal these openings from each other so that there is no communication between them.

Another object of the invention is to provide the clinker opening with an internal concealed clinker door.

Another object of the invention is to provide such a concealed clinker door with means for latching it dependent upon longitudinal movement of the door on its pivotal connections.

Another object of the invention is to provide a removable grate bar as an extension of the grate surface to the lower edge of the clinker opening to facilitate the removal of clinkers through the opening.

Another object of the invention is to provide for easy removal of parts to permit the introduction of the nozzle of an oil burner.

With the above and other objects in view the invention consists in the base door for boilers and furnaces as herein claimed and all equivalents.

Referring to the accompanying drawing, in which like characters of reference indicate the same parts in different views F ig. 1 is a front View of the lower part of a boiler or furnace provided with a base door embodying the present invention;

Fig. 2 is a sectional plan view thereof, and

Fig. 3 is a sectional view on the plane of line 33 of Fig. 2.

In the drawing, 10 indicates the base of a boiler or furnace of the domestic heating type containing the ash-pit opening 11 and the clinker opening 12 combined as a unit with a single surrounding disk-ground joint bead 13 making a gas-tight fit with the diskground joint bead 1 1 of the single door 15 for sealing both openings. Not only are both openings sealed by the door 15 in its closed position against all communication with the outside, but, by reason of a diskground joint bead 16 on a horizontal angle bar 17 separating the two openings 11 and 12 and preferably integral with the base,

Serial No. 490,463.

said openings are effectively sealed from each other since the door 15 has a diskground joint head 18 to contact therewith when the door is closed.

The joint beads 13 and 16 of the door frame are simultaneously ground in the same disk grinding operation so as to be in the same plane and likewise the joint beads 14- and 18 of the door, thus making a single problem of the tight sealing closure of the clinker opening and the ash-pit opening and effecting great economy in the cost of production.

The space between the horizontal angle bar 17 and the grate 19 on the same level therewith is occupied by an extension grate bar 20, preferably detachably connected at its ends by means of bolts 21 to supporting lugs formed on the sides of the opening in the boiler or furnace corresponding with the door opening. This extension grate bar brings the grate to the edge of the clinker opening, permitting clinkers to be readily removed theretl'irough and the arrangement is such that free access is had to the entire fire-bed through said clinker opening.

The clinker openings may be closed by a door 23 pivotally mounted in a bracket 24, which is adjustably secured to the angle crossbar 17. The bracket 24 has a longitudinal slot 25, through which studs 26 pass into cross-bar 17, thus permitting adjustment of the bracket horizontally.

A pivot pin 27 is supported in the forwardly extending ends of the bracket and upon it is pivotally mounted the bracket arms 28 of clinker door 23. Sufficient space is allowed for permitting endwise movement of the door 23 on the pivot pin 27 in order that said door may be latched and unlatched. A lug 29 projects downwardly from the upper edge of the clinker opening and a notch 30 in the edge of the clinker door may register therewith when the door is moved on its pivotal pin for that purpose, thus permitting the door to open but, when the closed door is moved back to the position shown in Fig. 1, it is securely latched by engaging behind the lug 29, as shown. A projection 31 on the front of the clinker door serves as a means for opening and closing it and for latching and unlatching it, an opening in the end thereof being adapted to be engaged by a poker for accomplishing these operations.

With the base door of this invention, combining the ash-pit opening with the clinker opening and both closed by the same door member, there are not only the manufacturing economies mentioned, but there is improvement in the appearance of the front of the boiler or furnace, the single door presenting a much neater appearance than the two doors previously used. Also, by the removal of the base door and clinker door and by cutting away the angle cross-bar, the heater may be converted for oil burner purposes, giving convenient access thereto for the oil burners of the external type.

What I claim as new and desire to secure by Letters Patent is:

1. In a base door for boilers and furnaces having an ash-pit opening and a clinker opening, a cross-bar separating the openings, a bracket on the cross-bar, a clinker door pivotally and slidably mounted on the bracket for closing the clinker opening, and a lug on the edge of the clinker opening adapted to be cleared by a notch in the edge of the clinker door in one position of the latter and to be engaged by the edge of the clinker door for latching it in another position thereof.

2. In a base door for boilers and furnaces including an ash-pit opening and a clinker opening, a cross-bar separating the openings, a bracket slidably adjustable on the cross-bar, a pivot-pin carried by the bracket, a clinker door pivotally and slidably mounted on the pin, a projection on the clinker door by which it may be swung and moved on its slidable mounting, and a lug on the edge of the clinker opening for register with a notch in the edge of the clinker door to permit the latter to open and close in one position and to engage the clinker door for looking it in another position.

In testimony whereof, I affix my signature.

FREDRIK IV. HVOSLEF. 

